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Ages Eligible for Study:

1 Year to 18 Years (Child, Adult)

Sexes Eligible for Study:

All

Accepts Healthy Volunteers:

No

Sampling Method:

Non-Probability Sample

Study Population

Data of children who satisfy the following eligibility criteria will be included.

Criteria

Inclusion Criteria:

Children (< 18 years old) with HIV infection

Have failed NNRTI-based ART

Received second-line regimen with either one or two boosted PIs (Note: low dose ritonavir to boost the other PI will not be count as additional PI)

Began ritonavir-boosted PI prior to June 30, 2007

Exclusion Criteria:

Have previously received PI treatment for longer than 30 days prior to the current PI regimen.